Feb. 7: Fazio Mechanical Services, a Pennsylvania-based heating and air conditioning contractor hired by Target, is identified as the conduit through which cyberthieves breached Target’s payment system.

Feb. 26: Target reports 2013 financial results, including $61 million spent in the fourth quarter on costs related to the cybertheft.

March

March 5: Target announces the resignation of Beth Jacob as senior vice president and chief information officer.

March 13: Bloomberg Businessweek publishes an article that says Target IT security missed warning signs from its malware detection software.

March 26: Target CFO John Mulligan again testifies on Capitol Hill, this time to answer allegations that the company missed opportunities to stop the ­cyberthieves.